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cmd/compile: simplify fingerprint logic
Historically, we sometimes recorded imports based on either package path ("net/http") or object file path ("net/http.a"). But modern Go build systems always use package path, and the extra ".a" suffix doesn't mean anything anyway. Change-Id: I6060ef8bafa324168710d152a353f4d8db062133 Reviewed-on: https://go-review.googlesource.com/c/go/+/395254 Trust: Matthew Dempsky <mdempsky@google.com> Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Cherry Mui <cherryyz@google.com>
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@ -369,16 +369,8 @@ func addFingerprint(path string, f *os.File, end int64) error {
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}
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copy(fingerprint[:], buf[:])
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base.Ctxt.AddImport(path, fingerprint)
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// assume files move (get installed) so don't record the full path
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if base.Flag.Cfg.PackageFile != nil {
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// If using a packageFile map, assume path_ can be recorded directly.
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base.Ctxt.AddImport(path, fingerprint)
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} else {
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// For file "/Users/foo/go/pkg/darwin_amd64/math.a" record "math.a".
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file := f.Name()
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base.Ctxt.AddImport(file[len(file)-len(path)-len(".a"):], fingerprint)
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}
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return nil
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}
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@ -96,19 +96,7 @@ func (ctxt *Link) readImportCfg(file string) {
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}
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func pkgname(ctxt *Link, lib string) string {
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name := path.Clean(lib)
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// When using importcfg, we have the final package name.
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if ctxt.PackageFile != nil {
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return name
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}
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// runtime.a -> runtime, runtime.6 -> runtime
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pkg := name
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if len(pkg) >= 2 && pkg[len(pkg)-2] == '.' {
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pkg = pkg[:len(pkg)-2]
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}
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return pkg
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return path.Clean(lib)
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}
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func findlib(ctxt *Link, lib string) (string, bool) {
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@ -127,34 +115,25 @@ func findlib(ctxt *Link, lib string) (string, bool) {
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return "", false
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}
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} else {
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if filepath.IsAbs(name) {
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pname = name
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} else {
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pkg := pkgname(ctxt, lib)
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// Add .a if needed; the new -importcfg modes
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// do not put .a into the package name anymore.
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// This only matters when people try to mix
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// compiles using -importcfg with links not using -importcfg,
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// such as when running quick things like
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// 'go tool compile x.go && go tool link x.o'
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// by hand against a standard library built using -importcfg.
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if !strings.HasSuffix(name, ".a") && !strings.HasSuffix(name, ".o") {
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name += ".a"
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}
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// try dot, -L "libdir", and then goroot.
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for _, dir := range ctxt.Libdir {
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if ctxt.linkShared {
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pname = filepath.Join(dir, pkg+".shlibname")
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if _, err := os.Stat(pname); err == nil {
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isshlib = true
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break
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}
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}
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pname = filepath.Join(dir, name)
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pkg := pkgname(ctxt, lib)
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// search -L "libdir" directories
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for _, dir := range ctxt.Libdir {
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if ctxt.linkShared {
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pname = filepath.Join(dir, pkg+".shlibname")
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if _, err := os.Stat(pname); err == nil {
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isshlib = true
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break
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}
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}
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pname = filepath.Join(dir, name+".a")
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if _, err := os.Stat(pname); err == nil {
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break
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}
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pname = filepath.Join(dir, name+".o")
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if _, err := os.Stat(pname); err == nil {
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break
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}
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}
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pname = filepath.Clean(pname)
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}
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@ -1,4 +1,4 @@
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// +build !nacl,!js,!windows,gc
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// +build !nacl,!js,gc
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// run
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// Copyright 2011 The Go Authors. All rights reserved.
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@ -29,10 +29,12 @@ func main() {
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return filepath.Join(tmpDir, name)
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}
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run("go", "tool", "compile", "-p=pkg", "-N", "-o", tmp("slow.o"), "pkg.go")
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run("go", "tool", "compile", "-p=pkg", "-o", tmp("fast.o"), "pkg.go")
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run("go", "tool", "compile", "-p=main", "-D", tmpDir, "-o", tmp("main.o"), "main.go")
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run("go", "tool", "link", "-o", tmp("a.exe"), tmp("main.o"))
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check(os.Mkdir(tmp("test"), 0777))
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run("go", "tool", "compile", "-p=test/slow", "-N", "-o", tmp("test/slow.o"), "pkg.go")
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run("go", "tool", "compile", "-p=test/fast", "-o", tmp("test/fast.o"), "pkg.go")
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run("go", "tool", "compile", "-p=main", "-D", "test", "-I", tmpDir, "-o", tmp("main.o"), "main.go")
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run("go", "tool", "link", "-L", tmpDir, "-o", tmp("a.exe"), tmp("main.o"))
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run(tmp("a.exe"))
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}
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